Persistence and graduation rates of four types of undergraduate students at the University of California, Davis, (UC Davis) are examined: domestic students with fewer than 12.5 college transfer units, including both regularly admitted students and those admitted by special action; and domestic students admitted with at least 84 but less than 135 college units (junior transfers). Included in the analysis are minority students admitted under an affirmative action effort. Findings include: UC Davis graduated 62.6% of new entrants admitted between 1971 and 1978 with fewer than 12.5 transfer units by winter 1985; a decreasing percentage of students are graduating in 4 years, going from a high of 48.0% for 1972 entrants to 26.6% for 1980 entrants; among new students entering with fewer than 12.5 college units, the proportion of those admitted by special action has increased from 3.8% of the 1971 cohort to 9.7% of the 1984 cohort; of entrants admitted by special action between 1971 and 1978 with fewer than 12.5 college units, only 28.3% had graduated by winter 1985; and 73.8% of students admitted as junior transfers between 1971 and 1980 had graduated by winter 1985. Information is also provided on Scholastic Aptitude Tests scores and grade point averages of new entrants. (SW)